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Consolidated Statement of Cash Flows (Parentheticals) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Supplemental Cash Flow Information [Abstract] |  |
Capitalized interest | $ 2,703 us-gaap_InterestPaidCapitalized | $ 1,230 us-gaap_InterestPaidCapitalized
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |
Supplemental Cash Flow Information [Abstract] |  |
Capitalized interest | $ 2,703 us-gaap_InterestPaidCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 1,230 us-gaap_InterestPaidCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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